Snob attachment



(Model.)

- Y 2 sneek-sheet 1. B. M. e LE. MIX.

KNOB ATTACHMENT'.- N0. 247,94o.

Patented Oct. 4,1881. Y

.3L- Illu y/ /ll/ 2 Sheets-Sheet 2.

(Medel.)

VE. M. se J. E. MIX.

KNOB ATTACHMENT.l

Ne. 247,940. Peeented oet. 4,1881.

Nv Firms. Plmwmlmgmplwn washingmn. n. c.

' UNITED STATES PATENT OFFICE.

EUGENE M. MIX AND JAMEs MIX, CE BUFFALO, NEW YonK, AssIeNoEs To THE CLARK MANUFACTURING COMPANY, oF SAME PLACE.

KNOB ATTACHMENT.

SPECIFICATION forming part of Letters Patent No. 247,940, dated October 4, 1881.

Application tiled August 1, 1881. (Model.)

To all whom it may concern.-

Be it known that we, EUGENE M. MIX and JAMES E. MIX, citizens of the United States, -residing at Buffalo, in the county ot` Erie and State of New York, have invented new and v useful Improvements in Door-Knobs, of which the following is a specification.

This invention relates to certain improvements in door and other knobs; and it has for 1o its objects to provide a means for securing a knob of any suitable material to a metallic shank in such manner as to prevent any pos sibility of its working loose from said shank, and at the same time form a connection that will give the utmost solidityand a highly-ornamental appearance to the knob.

To this end our invention consists of a knob constructed of any suitable material,and provided with an aperture extending entirelyT o through it, in combination with a metallic shank having a ange or shoulder adapted to bear against the rear of the knob, anda cylindrical or slightly-tapering extension adapted to tit in the aperture in the knob and eX- g 5 tend nearly through it, the said extension beingprovided wthlongitudinalivingsorfeathers on the outside adapted to tit in corresponding grooves formed in the walls ofthe aperture in the knob, to prevent the same from turning,

3o and with an interior female screw for the reception of a plain headed screw, which may be inserted from the outside, the head ot' said screw being adapted to bear against the outside of the knob, and the inner end being slotted, whereby it can be turned to clamp the parts together, as more fully hereinafter specitied.

In the drawings, Figure 1 represents a longitudinal sectional view, showing two of our l 4o improved knobs secured to the shanks and the connecting-spindle. Fig. 2 represents a detached view of the knob. Fig. 3 represents a sectional View of the knob detached from the shank, showing the central aperture and grooves for thereception of the wings or feathers. Fig. 4 represents a rear view of the shank; Fig. 5, a longitudinal section of the same; Fig. 6, a front view of said shank; and

Fig. 7, a sectional view of the shank and knob, showing the means of securing the knob to 5o the-shank.

The letter A indicates the.kI1ob,which may be constructed of any suitable shape or design, and of any desired material. The said knob is provided with a central aperture, B, extending entirely through it,`which aperture may be ot' cylindrical or other form, and may taper slightly from the rear to the front of the knob. The said aperture, when cylindrical in shape, is provided with one or more grooves, 6o (l, two diametrically opposite each other being represented inthe present instance.

The letter D indicates the metallic shank. This is hollow throughout, as shown in detail in Fig. 5, and is internally squared at its rear 65 for the reception of the spindle E, which is rectangular in cross-section. The said shank is provided externally with a ange or shoul der, F, and with an extension, G, which may be either ot cylindrical or other shape to cor- 7o respond with the shape of the aperture in the door-knob. The said extension may be made slightly tapering, and when ot' cylindrical shape is provided with one or more wings or feathers, H, which tit in the groove or grooves in the aperture in the door-knob, and prevent the knob-from turning upon the shank. The extension is provided with an internal female screw, I, which may either be formed directly in the body of the shank or may be formed in 8o a bushing, K, ot' softermetal, secured in said shank, as shown in Fig. 5, and scored longitudinally, as shown, to enable the clamping screw L to take better hold.

The letter E indicates the clamping screw. This is formed with a head, N, which is adapted to bear against the outer face of the knob. The said screw at its smaller` end is slotted, as indicated by the letter P, by means of which it can be turned by a screwdriver or 9o key inserted through the rear end of the shank, so as to bind all the parts securelyv together, as clearly indicated in Fig. 7 of the drawings.

As constructed, it will be perceived that there are no parts that will be apt to work loose, as the shank has a positive bearing inside and outside at the rear of the knob, while thebinding-serewhasapositivebearingagainst the outside, the said screw, besides forming asolid and secure connection, forming a highly ornamental appendage to the knob. Moreover, as the screw is slotted on its inner instead of its outer end, it is impossible to remove the knob from the shank from the outside without the use of special tools, thus securing all the advantages ot' a knob having the sha-nk secured to an inside connection, and a knob screwed to the shank from the outside, andobviating the objections attendant upon both of such styles of knobs. Y

What we claim, and desire to secure by Letters Patent, is-

The metallic shank provided with a shonl der or flange adapted to bear against the rear of a knob, and provided with an extension adapted to pass nearly through an opening in vthe knob, the said extension having one or EUGENE M. MIX. JAMES E. MIX.

Witnesses:

J oHNy K. CLARK, JNO. A. FRANKE. 

